CNNMoney | Nation's largest oil refinery forced to shut down as Harvey floods Port Arthur CNNMoney The largest oil refinery in the country is shutting down as Hurricane Harvey causes more catastrophic flooding. Early Wednesday, Motiva said it started closing its Port Arthur refinery "in response to increasing local flood conditions." The plant won't ... America's largest oil refinery preps shut down in Texas America's Largest Oil Refinery Preps Shutdown in Texas After Harvey Hurricane Harvey Impacts Crude Oil And Gasoline: What You Need To Know |